Alarm device.



, PATENTED APR. 18; 1905. T. N. DERBY. ALARM DEVICE.

APPLICATION FILED SEPT. 16, 1904. v

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PATENTEDIAPR. 18. 1905. T. N. DERBY.

ALARM DEVICE.

APPLIOATION FILED SEPT. 16, 1904.

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WITNESSES:

ATTORNEYS UNITED STATES Patented April 18, 1905.

PATENT OEEICE.

THOMAS NATHAN DERBY, OF ROUNDLAKE, NEW YORK, ASSIGNOR TO CHARLES H. STOOKWVELL, OF TROY, NEW YORK.

ALARM DEVICE.

SPECIFICATION forming part of Letters Patent No. 87,729, dated. April 18, 1905.

Application filed September 16,1904. Serial No. 224,633.

To (all whom it 'nmv concern:

Be it known that I, THOMAS NATHAN DERBY, a citizen of the United States, and a resident of Roundlake, in the county of Saratoga and State of New York, have invented a new and Improved Alarm Device, of which the following is a full, clear, and exact description.

The purpose of my invention is to provide a simple, durable, and economic alarm device adapted for attachment to the knob or door spindle of a door, whereby when the spindle is turned an alarm will be immediately sounded, and which is also adapted for use in connection with Window-sashes and the like, one

device being utilized for both the upper and the lower sash.

Another purpose of the invention is to so provide a trip connection between the part or parts to be operated and the alarm mechanism that said mechanism will be locked and prevented from operating the moment the knob or spindle is restored to its normal position or the window-sashes are closed and to so construct such trip connection that it may be readily and economically applied to any gong with connected clockwork.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a perspective view of the device, illustrating its attachment to a door-knob. Fig. 2 is a sectional side elevation of the complete device. Fig. 3 is a sectional front elevation of the clockwork for the gong, the gong being removed, illustrating the manner in which the escapement is tripped, and a sectional side elevation of a portion of the mechanism whereby the alarm is connected with the knob or spindle. Fig. 4: is a section through the knob-spindle and a front elevation of the device applied thereto. Fig. 5 is a vertical section through a portion of a window-frame and a portion of the upper and lower sashes in closed position and a side elevation of the applied alarm device; and Fig. 6 is a view similar to that shown in Fig. 5, except that the alarm is illustrated in operation, the lower sash having been raised. V The body A of the device may be given any desired shape and is in the form of a casing containing a clockwork mechanism B, adapted to operate upon a gong 14:, attached to the casing in any approved manner. The clockwork mechanism includes a pallet or escapement wheel 10 and an escapement 11, suitably pivoted at 12, as is shown in Fig. 3. An arched arm 13 is secured at its inner end to the escapement, carrying at its outer or opposite end a hammer 14, which in the action of the escapement repeatedly strikes the gong 14*, and thus sounds an alarm. The escapement, as usual, has an upper and a lower point of contact with the pallet or escapement wheel 10, and the upper point of contact of the escapement with the pallet or escapement wheel is normally effected by a spring 15, secured at one end to the outer casing-plate 15 for the clockwork mechanism, which spring is carried upward above the plate 15, beneath the arched portion of the striking-arm 13, and in engagement, therewith. The upper portion of said spring is practically horizontal, as is shown in Fig. 2. The said spring 15 serves to normally hold the striking-arm 13 in a position which will insure a locking engage ment between its attached escapement 11 and the pallet or escapement wheel 10.

A tubular extension 16 is provided for the body-casing A, having its inner end above the locking-spring 15, as is shown in Fig. 1, and in this tubular extension a trip-rod 17 is mounted to slide, its inner end resting at all times upon the free end portion of the lockingspring 15. through the upper portion of the tubular extension 16 and turns freely therein. This pintle is just above the trip-rod l7 and is adapted to act thereon. To this end that portion of the pintle 18 within the tubular extension 16 has a recess 19, and in one position of the pintle 18 the trip-rod enters the recess 19, relieving the spring 15 from pressure and permitting it to act upon the striking-arm 13 to A pintle 18 is passed loosely effect a locking engagement between the escapement 11 and the pallet or escapement wheel 10. l/Vhen, however, the pintle 18 is turned to bring its cylindrical or uncut surface over the trip-rod 17, the said rod is forced downward and depresses the spring 15, carrying the escapement 11 out of looking ongagement at its locking end with the escapement or pallet wheel 10, but as the opposite end of the escapement at such time engages with the pallet or escapement wheel the said wheel, which is free to revolve, imparts a reciprocating movement to the escapement, and consequently a corresponding motion to the striking-arm, thereby causing the hammer 14 to rapidly strike the gong 14: and sound an alarm. I/Vhen the recess 19 in the pintle 18 is-again brought over the trip-rod 17, the spring 15 immediately restores the escapement to its locking engagement with the pallet or escapement wheel.

The rotary pintle 18 is attached to the doorknob 21 of the door 22 by spring-claws 20, secured to the pintle, as is shown in Figs. 1 and 2; but if it is desired to attach the device to the spindle 23 of a knob the attachment shown in Fig. 4 is employed, which attachment consists of an angle-bar 24:, attached tothe pintle 18, having its vertical or upwardly-extending member provided with a jaw 25, preferably serrated, while a similar jaw 26 is adjustably secured to the upper portion of the angle-bar 24: by a lock-nut 27 or its equivalent. The jaws 25 and 26 are held in clamping engagement with the spindle 23 through the adjustment of the said nut 27.

In Figs. 5 and 6 I have illustrated the adaptation of the alarm device to the upper and lower sashes C and C of a window-frame C wherein upper and lower spring-arms 28 and 29 are attached to the back of the body Aof the alarm, adapted one for engagement with the upper face of the meeting-rail of the lower sash and the other with the under face of the meeting-rail of the same sash, and a trip-rod 173, corresponding to the rod 17 in the other views, is provided with an upper head 30.

A guide, usually in the form of an eye 31, is secured upon the upper surface of the body A of the alarm, in front of the projecting portion of the trip-rod 17, which guide receives the outer end of the trip or actuating arm 32, corresponding to the pintle 18, which trip or actuating arm is adapted when the lower sash is opened to press upon ,the head 30 of the trip-rod 17 and remove the escapement from looking engagement with the alarm mechanism, and the same result is accomplished when the upper sash is opened.

A spring 33 is attached to the trip or actuating arm 32 and to the upper spring-clamping arm 28, which spring tends to draw the trip-arm downward to operative engagement with the trip-rod 17, and at the outer end of the trip or actuating arm 32 a nut 34 is 10- In the operation of the device as applied to windows when the windows are closed or when they are slightly opened the adjusting-screw 35 is made to engage with the meeting-rail of the upper sash, as is shown in Fig. 5, and is then adjusted downward until the actuating or trip arm 32 is in a horizontal position or in a position to clear the upper end of the trip-rod 17, when the spring 33 is placed under tension. In this position of the device the alarm is silent. However, should the lower sash be raised to any great extent beyond the position it formerly occupied the adjusting-serew 35 will be removed from engagement with the meeting-rail of the upper sash and the spring 33 will instantly act to draw the actuating or trip arm 32 in such engagement with the trip-bar 17 as to release the escapement and cause an alarm to be sounded. The same action will take place in the event that the upper sash is lowered beyond the point to which the screw 35 was adjusted.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In an alarm device, a body-casing, aclockwork mechanism in the casing, including a gong, a pallet or escapement wheel, a pallet engaging with the wheel, an arched strikingarm carried by the pallet, a spring having lifting action on the arched portion of the striking-arm, atrip-rod having guided movement in the body and having bearing on said spring, a pintle mounted to turn on the upper end of the trip-rod, having a recess therein to receive the outer end of the rod, and means connected with the pintle, adapted for attachment to a movable object.

2. The combination with a casing, a clockwork mechanism within the said casing, including a pallet or escapement wheel, a pallet, an arched striking-arm carried by the pallet, a gong supported on said body-casing, adapted to be acted upon by the striking-arm, and a tubular extension from the said body-casing, of a spring secured at one end to the said casing, which spring extends beneath the arched portion of the striking-arm and in engagement therewith, the spring having a lifting action upon the striking-arm, whereby to normally hold the pallet in engagement with the the tubular extension for operating the triprod through the movement of the object to which the alarm may be applied.

3. The combination with a casing, a clockwork mechanism within the casing, including a pallet or escapement wheel, a pallet, an arched striking-arm carried by the pallet, a gong supported on said body-casing, adapted to be acted upon by the striking-arm, and a tubular extension from the said body-casing, of a spring secured at one end to said casing, which spring extends beneath the arched portion of the striking-arm and in engagement therewith, the spring having a lifting action upon the striking-arm whereby to normally hold the pallet in engagement with the escapement-wheel, a trip-bar mounted to slide in the tubular extension of said casing and having its inner end in engagement with the free end of said spring, a pintle mounted to turn at the outer end portion of the tubular extension from said casing and beyond the outer end of the trip-bar, which pintle within the tubular extension is provided with a recess adapted to receive the upper end of the tripbar, and means attached to said pintle, whereby the device may be secured to a door-knob or similar object.

4. The combination with a casing containing a clockwork and a gong operated by the clockwork, and provided with a trip-rod projecting from the casing, of clamping-jaws,

and arevoluble pintle carried by said jaws and with which the upper end of the trip-rod engages.

5. The combination with a casing containing aclockwork and a gong operated by the clockwork and provided with a tubular extension and a trip-rod extending into the tubular extension, of a pintle mounted in the upper end of the tubular extension and having a recess therein to receive the upper end of the trip-rod, and clamping-jaws carrying the said pintle.

' 6. In an alarm, the combination of a casing provided with a guide, a clockwork and gong in the casing, a trip-rod projecting from the casing, and a member adapted for attachment to a movable object, said member working in the guide of the casing and engaged by the said trip-rod.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS NATHAN DERBY.

Witnesses:

WILLIAM A. BEDELL, NELLIE O. BEDELL. 

